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Today I will introduce a consumable used in repairing electronic products

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Solder mask ink

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As you can see now

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The green-colored paste-like object in this plastic tube is similar to paint

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We call it solder mask ink

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Maintenance staff often call it green oil

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In fact, green oil is not only green in the market

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There are also some other colors like black, blue, red, etc.

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Because the green color is the easiest to buy in the market

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So most of the maintenance staff use this green solder mask ink

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Why there are so many colors

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Because there are many colors of the surface of the circuit board we repair

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The motherboards of the iPhone series I'm holding are all dark brown, close to black

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Other models may have other colors

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Android may be red

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blue

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There is also this dark brown similar to iPhone

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If the requirements for the appearance of the surface are relatively high

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Then we can choose the same color as it

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So

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Almost no signs of repairs

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What circumstances do you need to use this solder mask material?

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Let's find out

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The middle of this motherboard has been smeared with green oil

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Why?

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Let's take a look

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Clean the green oil with PCB cleaner

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The chip in this area has been removed

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The original motherboard was dark brown

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All solder joints are dark brown around

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The middle area is exposed to the original color of copper

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So the exposed area and the four surrounding solder joints are easily shorted together

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Short circuit may occur when soldering

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In order to avoid the connection between the surrounding solder joints and this area of the exposed copper

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So we gotta apply solder mask ink to this area

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Next, I will demonstrate how to apply

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Open the green oil protection cover

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Dip a little green oil with tweezers

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This operation can be done under the microscope

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When applying green oil

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Apply in small quantities with a few times

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If the amount is not enough at one time, you can dip a little more

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Don't apply a lot at once

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When you apply too much, the green oil height will become very high

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When soldering the chip, it may come up from the bottom to the top of the chip

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This will lead to poor soldering of the pins of our chip

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After applying green oil

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We can use UV curing light

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To solidify it

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After curing

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This area can't be wiped off any more

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So much for solder mask ink.Thank you for watching